wallis



No. 609,995. Patented Aug. 9, |899. H. E. wALLls.

FURNACE.

(Application led Dec. 5. 1896.)

(No Model.) 3 Sheets-Sheet 2.

lllllllllllllllllll. 3

} No. 609,995. Patented Aug. 9, |999. H. E. wALL|s.

FUBNAGE.

(Application filed Dec. 5, 1896.) (No Model.) y a sheets-'sheet 3.-

'me nonnfs Firms co.. rnofouw'g., wAsmNcYoN, uA q.

i Nirnn STATES l ArnNi rricn.

lWILLIAM n.

NILES, OF SAME PLACE.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 608,995, dated August 9, 1898. Application filed Deeem'ber-5,1896. Serial No. 614,540. (No model.)

To @ZZ whom it may concern: v

Be it known that I, HENRY E. WALLIS, a citizen of .they United States, residing at Chicago, in the county of Oook and State of Illinois, have invented certain new and useful Improvements in Furnaces, of which thefollowing is afull, clear, and exact specification.` The primary object of my invention lis to provide improved means whereby a complete dumpable section ofa grate composed of a se` ries of suchdumpable sections may be brought opposite the stoking-door each time the door is opened, whereby thefresh fuel thrown in will lodge substantially on but one of the sections, and hence substantially all of the fuel will be consumed on each section before any of it or the ashes thereon are ready to be dumped, and as a result when a section is dumped A the unconsumed fuel will not be wasted nor will any of the remaining'sections be occupied with any considerable amount of ashes or consumed fuel mixed with unconsumed fuel.

A further obj ect of my invention is to cause a thorough coking of the fuel at the forward or stoking side of the fire-box before its conveyance to the rear or hotter region of the fire-box.

With these ends in view my invention consists in certain features of novelty by which the said objects and certain other objects hereinafter appearing are attained, all as fully described with reference to the accompanying drawings and more particularly pointed out in the claims.

In the said drawings, Figure 1 is a plan sectional view of my improved furnace, taken Fig. 2 isa vertical on the line 3 3, Fig. 2. longitudinal section thereof,taken on the line 2 2, Fig. 1. Fig. 3 is a "transverse sectional view taken `on the line 3 3, Fig. 1; and Fig. 4 is a front elevation showing the apparatus whereby the opening of the door and the simultaneous rotation of the grate are eected.

In carrying out my invention I employ a fire-box, which is preferably provided with a circular fire-pot or with circular walls 1, so as to conform with the grate, which is 'also` circular and which is composed of a number 'of independentlytilting sections 2 3 4 5 6 7,

each having at its outerend a j ournal- 9, supportedlupon a marginal'ring l0, and at its inner end a journal 11, supported :in a common hub 12, connected to the ring 10 by a number of spokes 13. The grate-sections 2 3 4, 85e., are segmental in form'and are situiated between the spokes 13,` as more clearly ,j showneinA Fig. A1, and being-thus pivoted on l the"hub'12"an`d "ring 10 each is capable of tilti ing independently ofthe other when it is desired to dump the whole or any portion of the lire'. 'In order that each' Msection may be `held against accidental tilting or (dumping,

each may be provided at one side or corner with a lugr or stop 14, adapted to engage under one of the spokes 13, as shownin Fig. 1. Each of the outer journals or trunnions 9 is provided with a key-post 1 5, whereby the grate may be tilted when the particular section is broughtopposite the stacking-aperture or lire-door 16, as will be understood, the ring ,lO'being cut away for vvthe accommodation of the key-posts 15, as shown at 17, and the seats or notches in which the trunnions or journals 9 11 are supported being open at their upper sides, so that the grate-sections may be readily removed at will when it is desired to repair or renew them.

The central hub 12 is supported upon an up right pivot 18, which is formed on or secured to a transverse beam 19, having its ends suitably supported inthe masonry of the furnacewalls below the grate. This pivot 1S sustains the major part of "the weight of the grate and permits it to readily revolve, while the outer edge of the grate is held against deflection by means of a number of brackets 20, set into the wall ormasonry of the furnace and bearing A under a flange 21, projecting from the outer side ofthe ring 10, such liange 21 being also cut away, like the ring 10, for the accommodation of the wrench when applied to `the key-posts 15, but such cut-away portion being of less width than the bracketsQO, so as to avoid the possibility of the brackets engaging therein. i

In the space between the upper surface of themarginal ring 10 and the lowerkedge o f the `fire-pot 1 is inserted a ring 48, provided. on its under side with a number of teeth which project downwardly towardlwithout lactually touching the ring 10 andfprev'ent the cinders IOO ` and fuel from escaping, while at the same time permitting the draft to rise from the ashpit and pass into the fuel on the grate around the outer edges of the ring 10.

The under side of the ring 10 is provided at suitable intervals, preferably one for each of the grate-sections 5, with a number of teeth or notches 22, whose one side is abrupt or precipitous, while the other is inclined, as shown more clearly in Figs. 2 and 3, and pivoted under the grate upon the pivot 1S is a pawl or dog whose one end 23 is adapted to engage with the teeth 22, and thus impart rotation to the grate, while the other end of the dog is provided with a weight 24, which holds the end 23 into engagement with the teeth 22 and at the same time permits the end 23 to be deiiected sufficiently to pass over the inclined side of the tooth and engage with its abrupt side, as will be understood. The dog 23 is supported by the beam 19, and in order that its ends may rise and fall in the manner described the interior of its hub is flaredor rounded, as shown at 25, so that it may rock upon the pivot 18. This dog or pawl 23 24 might of course be operated at will by any suitable connection extending to the exterior of the furnace; but inasmuch as it will require considerable power to rotate the grate in large furnaces and it is desirable to have the sections of the grate successively presented opposite the stoking-aperture or fire-door when the door is opened for the introduction of fuel I prefer to effect the movement of the grate by some suitable motor or engine and to simultaneously open the fire-door, so that the fireman may simultaneously open the door and present a new section of the grate for the reception of fresh fuel without giving special thought to the operation. To this end I connect the dog 23 to a pull-bar 26, whose outer end may be carried through a suitable aperture in the furnace-wall and is pivoted to a crank-arm 30, projecting downwardly from a rocker-shaft 31, secured by boxes or straps 32 to the wall of the furnace and having at its other end a slotted crank 33, in the slot of which works a stud 34, formed on the end of a piston-rod 35, projecting from a steam-cylinder 36. By this means it will be seen that when the piston-rod 35 is forced upwardly the rod 26 will be pulled-outwardly. The outer end of the rod 26 is curved upwardly toward its pivotal connection with the arm 30, so as to permit of the necessary movement without causing the rod 2G to strike against the upper edge of the ash-door opening, as will be understood.

In order now that this same movement may open the fire-door 37, I provide the rockershaft 31 with an additional crank-arm 38, which is connected by a short link 39 with a crank-arm 40, projecting outwardly from the hinge-pintle 41, to which the door 37 is secured. Steam may be turned into the cylinder 36 in any suitable way, but this is preferably accomplished by means of a depressible foot-piece 42, pivoted to the fioor or other suitable support and having a rocker-shaft 43, which also constitutes the stem of a twoway valve or cock 44, which governs the inlet-pipe 45 and the exhaust-pipe 4G, so that when the foot-piece 42 is depressed the steam will be admitted to the cylinder 36 for raising the piston-rod 35, and when the foot is removed from the foot-piece it will be raised by a spring 47, turning the exhaust-port of the plug into communication with the cylinder, the weight of the door 37 in the meanwhile causing such door to close and also returning the end 23 of the dog or pawl to the rear extremity of its movement and enabling it to engage with another one of the teeth 22. In the drawings the fire-door is shown partially open and the grate partially turned.

Extending athwart the fire-box and also across the forward or stoking side of the grate immediately over the fire-door opening is a crown or arch 49, which projects rearwardly in the tire-box about half the length or diameter thereof. The purpose of this crown or arch is to effect a thorough coking of the coal or fuel when it is introduced into the tire-box and before it has been conveyed to the hotter region of the fire-box by the rotation of the grate.

IIaving thus described my invention, what I claim as new, and desire to secu re by Letters Patent, is-

1. A furnace having in combination a firebox provided with a door; a rotatable grate; means connected with said door and having operative relation to said grate whereby the movement of the door will effect the movement of the grate; a foot-piece; and means having operative relation to said foot-piece and door whereby the movement of the footpiece simultaneously effects the movement of the door and grate, substantially as set forth.

2. A furnace having in combination a firebox provided in its vertical side with a stoking-aperture, a gravitating door closing said aperture, a rotatable grate having teeth or notches, a pivoted dog or pawl engaging with said teeth or notches, and being connected with said door whereby the gravitation of the door will move said dog in one direction, an engine having a piston and piston-rod connected with said door for raising it, a valve for admitting pressure to said engine, a footpiece for moving said valve in one direction and causing said engine to raise said door and means for automatically moving said valve in the other direction for permitting the door to close, substantially as set forth.

3. Afurnace having in combination a firebox provided with a stoking-aperture, a door closing said aperture; a rotary grate composed of independently-dumping sections; ratchetteeth having operative relation to said grate; a pawl arranged to engage with said teeth for rotating said grate, and a connection between said pawl and door whereby the opening of the door will rotate the grate, said ratchet- IOO IIO

teeth being so disposed and Jthe stroke of the substantially upon only the section opposite paWl so proportioned with relation to the po- Vsition of the stoking-aperture and the movement of the door that each time the door is opened the grate Will be rotated the distance of one section and each section will be suceessively brought completely opposite the.

door whereby the fuel thrown in will lodge the door, substantially as and for the purposes 1o set forth.

H. E. WALLIS. 

